The correct answer is letter D. an economy based on trade. The people who migrated to Melanesia developed <span>an economy based on trade. Before the time of currency was used, people back then do trading with their property they own if they want to have something. It's like the same as the barter system or the barter economy.</span>
Answer: The answers are in the steps hopes it helps
Explanation:
1. We might learn about the planet and compare it to our planet earth.
2. We might have to know who can survive on the planet or how to survive on the planet
3.We might sent astronauts to the planet.
The four seasons happen because of the tilt of the earth axis. During different times of the year, the rays of the sun hit different parts of the earth more directly.
The angle of the earth's tilts the northern hemisphere towards the sun during summer season while the southern hemisphere is tilted away causing winter.
Without the tilt of earth, there would be no seasons. Regions along the equator would be always be warm and sunny while those in the southern and northern hemisphere would be stuck in a gradual gradient of cold and hot.
The Amazon and the Mississippi river similarities is Both played a role in the development of civilization. Both are key players in the surrounding ecosystems.<span>
Hope this answer your question! :)</span>
